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Gayana 72(1) 2008.Pmd Gayana 72(1): 79-93, 2008 ISSN 0717-652X RADIOLARIOS POLYCYSTINA (PROTOZOA: NASSELLARIA Y SPUMELLARIA) SEDIMENTADOS EN LA ZONA CENTRO-SUR DE CHILE (36°- 43° S) POLYCYSTINA RADIOLARIA (PROTOZOA: NASSELLARIA AND SPUMELLARIA) SEDIMENTED IN THE CENTER-SOUTH ZONE OF CHILE (36°- 43° S) Odette Vergara S.1, Margarita Marchant S. M.1 & Susana Giglio2,3 1Departamento de Zoología, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Casilla 160-C, Concepción, Chile, [email protected]. 2Laboratorio de Procesos Oceanográficos y Clima (PROFC), Universidad de Concepción, Casilla 160-C, Concepción, Chile. 3Magíster en Ciencias con mención Oceanografía, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Casilla 160-C, Concepción, Chile. RESUMEN Los radiolarios son protozoos planctónicos marinos, los cuales, a pesar de ser sólo una célula, son sofisticados y complejos organismos. La Subclase Radiolaria está formada por 2 superórdenes: Trypilea y Polycystina, siendo el último el más estudiado, pues su esqueleto de opal es más resistente a la disolución en agua de mar y por ende, más comúnmente preservados en el registro fósil. Los radiolarios han sido usados como una útil herramienta oceanográfica, bioestratigráfica y paleoambiental, gracias a su esqueleto de sílice y a su gran rango geológico. En nuestro país el conocimiento de este grupo es muy escaso, es por esto que el presente trabajo, tiene como principal objetivo, aportar con la identificación y descripción de especies de radiolarios Polycystinos, no antes registrados para esta zona en particular. El material fue recolectado por la Expedición PUCK R/V Sonne Cruise SO-156 Valparaíso-Chiloé-Talcahuano realizada en mayo de 2001. Se analizaron 20 muestras tomadas entre 125 y 3.485 m de profundidad, distribuidas desde Concepción hasta Chiloé (36º-43ºS). Se identificaron un total de 28 especies pertenecientes a 20 géneros y a 9 familias. La mayor cantidad de individuos fue encontrada en la estación 3 frente a Concepción a 798 m de profundidad, lo que se asocia a los periodos de surgencias estacionales y a procesos de sedimentación de las testas y disolución del opal relativamente cortos. Hacia el sur disminuye notablemente la abundancia de ambos órdenes estudiados. PALABRAS CLAVES: Radiolarios, Polycystina, Nassellaria y Spumellaria, recientes, opal, Pacífico sureste, Chile. ABSTRACT The radiolarians are planktonic marine protozoans, which although be only one cell, are sophisticated and complex organisms. The Subclass Radiolaria is formed by two superorders: Trypilea and Polycystina, this last is the most studied, because its skeleton from opal is resistent to the sea water disolution and for this reason are preserved in the fosil record. The radiolarians have been used like a useful oceanographic, biostratigraphic and paleoambiental tool for their silica skeleton and large geologic range. In our country the knowledge of this group is poor, for this reason the present work has the objective to contribute with the indentification and description of Polycystins radiolarians not described and recorded before for this particular zone. The material used was obtained to the PUCK R/V Sonne Cruise SO-156 Valparaíso-Chiloé-Talcahuano Expedition realized in may of 2001. The 20 samples were obtained with a multicore between 125 and 3.485 m depth distributed from Concepción to Chiloé (36°-43°S). Were idientified 28 species appertaining to 20 genus and 9 families. The major amount of individuals was found in the station 3 in front of Concepción to 789 m depth, this could be associated at the seasonals upwelling periods and process to sedimentation of the shells and opal disolution relatively short. Southward decrease the abundance of the two orders studied. KEYWORDS: Radiolarians, Polycystina, Nassellaria and Spumellaria, recents, opal, South Eastern Pacific, Chile. 79 Gayana 72(1), 2008 INTRODUCCION organismos está limitada por la disponibilidad del sílice disuelto, en aquellos lugares donde su concentración Los radiolarios son protozoos marinos, holoplanctónicos, es alta, las diatomeas son el fitoplancton dominante cuya máxima concentración se encuentra en la capa (Libes 1992) y por lo tanto, es de esperar que la fótica o hasta los 100 m de la superficie, pero también producción de radiolarios también sea alta. pueden vivir a varios metros de profundidad en las En Chile la primera información que se tiene de los zonas epipelágica y mesopelágica (Kling & Boltovskoy radiolarios corresponde al estudio realizado por 1995), distribuyéndose ampliamente en los mares y Haeckel (1887) con material recolectado por el océanos mundiales (Grupta et al. 2002). Aparecieron en Challenger (1873-1876). Zapata & Olivares (2005) el Precámbrico y su preservación en los sedimentos describieron e ilustraron 30 especies de radiolarios en marinos ha permitido usarlos (tanto fósiles como Caldera. También en la misma zona norte Zapata & recientes) en una variedad de estudios: bioestratigráficos Rojas (2006) describen e ilustran 60 especies de (Wesberg & Riedel 1978), biogeográficos (e.g. Polycystinos. Boltovskoy 1994, 1999; Kling & Boltovskoy 1995), Como se infiere, existen muy pocos estudios de paleoclimáticos y de productividad (e.g. Boltovskoy radiolarios en nuestro país, es por esta razón que el 1988; Boltovskoy et al. 1993), paleoecológicos (e.g. objetivo principal de este trabajo es dar a conocer la Molina-Cruz & Herguera 2002) y taxonómicos (e.g. radiolariofauna presente en los sedimentos desde Haeckel 1887; Benson 1966; Riedel 1967a, b; Abelmann Concepción (36°S) hasta la Isla de Chiloé (43°S) a 1992). diferentes profundidades, realizando análisis cuali y Se caracterizan por la presencia de extensiones cuantitativo de la radiolariofauna. protoplasmáticas o seudópodos del tipo axópodos y filópodos, y por la presencia de una conchilla o esqueleto silíceo de configuración generalmente radial, MATERIALES Y METODOS que constituye el principal atributo para identificar las especies, especialmente las sedimentadas y fosilizadas El material estudiado fue recolectado durante la (Campbell 1954; Kudo 1969). La clasificación de Expedición científica PUCK SONNE SO 156 (Hebbeln Radiolaria se basa exclusivamente en el esqueleto. Sin et al. 2001), realizada en mayo de 2001. Se recolectaron embargo, se incluyen algunas características del 20 muestras con multicore a profundidades que citoplasma que permiten identificar algunos órdenes. variaron entre 125 y 3.485 m, desde Concepción hasta Un rasgo que distingue a todos los radiolarios es la la Isla de Chiloé (36º- 43ºS) (Tabla I, Fig.1). cápsula central, una membrana proteica perforada que Todos los análisis se realizaron en el Laboratorio de divide el citoplasma en dos áreas: el endoplasma o Foraminiferología de la Facultad de Ciencias Naturales citoplasma intracapsular, y el calimma o citoplasma y Oceanográficas (Universidad de Concepción), extracapsular. La cápsula central puede ser esférica donde se procedió a extraer aprox. 1 cm (10 cm. de (Spumellaria) o elongada y periforme (Nassellaria). El diámetro) del sedimento del multicore, el que fue lavado, citoplasma intracapsular cuenta con sustancias de secado y tamizado, separándolo en 2 fracciones (>212; reserva y con organelos (núcleo o nucleolo, 212-150 mm). Este sedimento fue revisado bajo lupa y mitocondria y otros organelos, excepto vacuolas los ejemplares obtenidos se depositaron en reglillas digestivas) que cumplen las funciones reproductivas faunísticas para realizar su identificación específica y y producción de energía. El esqueleto de las formas contabilización. solitarias posee un tamaño que varía entre los 30 y Las especies encontradas fueron fotografiadas 300 µm (Boltovskoy 1998), pero en las colonias, de utilizando un microscopio electrónico de barrido forma excepcional, se han encontrado tamaños de (Laboratorio de Microscopía Electrónica, Dirección hasta 3 m (Swanberg 1979). de Investigación, Universidad de Concepción). Para Los radiolarios juegan un importante rol en el ciclo de la determinación taxonómica de las especies se sílice de los océanos y, junto con diatomeas y utilizaron trabajos de los siguientes autores: Haeckel silicoflagelados, son los responsables de generar la (1887), Takahashi (1991), Van de Paverd (1995) y formación de sedimentos silicios en ambientes marinos Boltovskoy (1998). Para la determinación de los profundos de bajas latitudes, tal como sucede en la Taxa superiores se siguió el criterio de Cavalier-Smith zona este del Océano Pacífico. La producción de estos (1998). 80 Radiolarios sedimentados en la zona centro-sur de Chile: VERGARA, O. ET AL. FIGURA 1. Distribución geográfica de las 20 muestras de sedimento extraídas entre la Bahía de Concepción y la Isla de Chiloé (36º-43ºS) durante mayo de 2001. FIGURE 1. Geographic location of the gathered stations between Concepción and Chiloé Island (36º-43ºS), Chile, during may, 2001. TABLA I: Ubicación geográfica y profundidad de las muestras recolectadas y analizadas entre la Bahía de Concepción y la Isla de Chiloé (VIII - XI Región), Chile. TABLE I. Geographic location and depth of the samples collected between Concepción Bay and Chiloé Island (VIII-XI Región), Chile. Estación Nº estación Latitud (ºS) Longitud (ºW) Profundidad (m) (Geo-B) 7163-5 1 36. 42 73. 59 539 7166-3 2 36. 46 73. 77 1.294 7162-4 3 36. 54 73. 66 798 7203-2 4 38. 02 73. 93 281 7202-1 5 38. 12 73. 93 629 7198-1 6 38. 17 74. 39 2.287 7199-2 7 38. 19 74. 33 1.673 7200-1 8 38. 20 74. 07 364 7212-1 9 39. 69 74. 37 1.469 7215-1 10 39. 81 74. 06 498 81 Gayana 72(1), 2008 Continuación Tabla I Estación Nº estación Latitud (ºS) Longitud (ºW) Profundidad (m) (Geo-B) 7211-1 11 39. 93 74. 26 890 7216-1 12 40. 04 73. 93 165 7197-1 13 40. 99 74. 55 816 7195-1 14 41. 20 74. 40 521 7193-1 15 42. 17 74. 71 209 7175-1 16 42. 45 75. 21 1.967 7174-1 17 42. 54 74. 99 1.222 7177-1 18 42. 58 74. 83 909 7180-1 19 43. 36 75. 56 3485 7182-1 20 43. 36 74. 91 301 RESULTADOS Dictyocoryne profunda Ehrenberg, 1872 Dictyocoryne truncatum Ehrenberg I.
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